*{
    margin:0;
    padding:0
}
html,body{
    overflow: hidden;
}
#box{
    width:700px;
    height:400px;
    background:url("img/jdtj1.jpg");
    position: absolute;
    left:50%;
    top:50%;
    margin-top:-200px;
    margin-left:-350px;
}
#box span{
    position: absolute;
    left:0;
    top:0;
    background:url("img/jdtj1.jpg");
    transform:perspective(800px) translate(0px,0px) rotateX(0deg) rotateY(0deg) scale(1);
}